org.hibernate.MappingException：No JDBC類型的方言映射：-9

Question

當我試圖從SQLServer2008中的表中獲取記錄時，得到的異常名爲：org.hibernate.MappingException：No JDBC方法的映射類型： -9爲什麼？

雖然配置文件是正確的。

Answer 1

我改變了查詢，並明確地將其轉換爲varchar和它的工作.......

String myquery = "select cast(t2.name as varchar) column_name from sys.objects t1 inner join sys.columns t2 on t2.object_id = t1.object_id"+ 
" left join sys.indexes t3 on t3.object_id = t1.object_id and t3.is_unique = 1 left join sys.index_columns t4 on t4.object_id = t1.object_id and t4.index_id = t3.index_id and t4.column_id = t2.column_id where (upper(t1.type) = 'U' or upper(t1.type) = 'V') and upper(schema_name(t1.schema_id)) = 'dbo' and upper(t1.name) = 'TEST'"; 

Answer 2

這是Hibernate映射類型的問題。

你可以擴展一個方言。例如：

public class SQLServerDialectOverrider extends SQLServerDialect{ 
    public SQLServerDialectOverrider() { 
     super(); 
     registerHibernateType(Types.NVARCHAR, Hibernate.STRING.getName()); 
     registerHibernateType(Types.LONGVARCHAR, Hibernate.TEXT.getName()); 
    } 
} 

使用此類作爲方言類。